Name: Vladyslav Shtabovenko Date: 11/26/14-09:19:57 PM Z
Hi,
EpsEvaluate doesn’t normally expand momenta, but actually it’s just
one
additional command that you need:
Eps[Momentum[p1], Momentum[p2],
Momentum[p3],
Momentum[p1 + p2]] // MomentumExpand // EpsEvaluate
Cheers,
Vladyslav
Am 26.11.2014 um 14:42 schrieb Lingxiao Xu:
> Hi,
> Thanks for all the help!
> So my real problem is how to modify the code which I posted in my
> first message to prevent all these trivial contractions of
LeviCivita
> tensors from appearing. Since for the process which I want to
evaluate,
> 9 terms would come out. I just don’t want to replace the trivial
> LeviCivita tensors one by one.
> Furthermore, after checking FeynCalc manual, I think the function
> EpsEvaluate might help. But it doesn’t work correctly. For
example,
> “LC[][p1, p2, p3, p1 + p2] // EpsEvaluate”â€?
> gives” -\[Epsilon]^(p1p2p1+p2p3) “ rather
> than”
-\[Epsilon]^(p1p2p1p3)+â€?-\[Epsilon]^(p1p2p2p3)”.â€?â€?
>
> I am using FeynCalc 8.2.0 with Mathematica 9.0 on Win7(64bits).
> Thanks for more help.
>
> Best Regards!
> Lingxiao
>